Supply systems must assure an adequacy of hot and cold water. An average rule-of-thumb design for hot water for resident usage (at 110 degrees Fahrenheit) is to provide ____________________ in addition to kitchen and laundry use.
a) 1.5 gallons per minute per bed
b) 2 gallons per minute per bed
c) 2.5 gallons per minute per bed
d) 3 gallons per minute per bed